Originally Posted by WarrenMN
Garmin might have a problem that I've found in a lot of different sonars, where they give you a depth might be delayed from where the coordinate was taken, or vise versa. What then happens is the faster you go the more distance between the two. When going back and forth mapping the end product ends up with surpentine contour lines. Early on the Lowrances had it to such a degree I warned people not to collect data over the speed of a troll. The last time I up dated my Simrad one of the big boys sonars actually had almost six seconds between when the unit took the coordinate and put it on the NMEA line and when it took the depth. So when I got the Humminbird the plan was it was for just its side scan. I was really happy when it worked perfect for the mapping. But now I have a Simrad sonar and Airmare B256 transducer that I don't use. Back up I guess.
Per, owner of DrDepth, is working on ways to eliminate this with his software. I've lost track as to how its coming along seeing I don't have to worry about it. And talking to Doc, he thinks most of it in the Lowrance hard drive units is gone, not sure about the others.
WarrenMN
PS I get enough of the classes when I sit in on Doc's.